You can tweak your "ndd" settings in Solaris to a more reasonable
timeout for these types of client disconnects. Just be careful, while
setting it to a minute may seem very reasonable in this case, the ndd
setting will effect the whole system, and all it's network connections.
Kolev, Nik wrote:
Thanks Wez,
Let me rephrase my question then. Assume the viewer and server
communicate over a low quality (and low bandwidth) network. What are the
scenarios (other than unplugging the network cable) where the client
"goes fishing" with an info/error message but the server continues
running the session until the idle timeout tells it to dispose it? And
how can one guard (terminate the session earlier than the idle timeout)
against them happening?
-nik
-----Original Message-----
From: James Weatherall [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 08, 2006 5:51 AM
To: Kolev, Nik; [email protected]
Subject: RE: How to terminate VNC sessions immediately at network
connection drop
Nik,
The only reason your viewer detects the connection drop is that your
computer has had the cable physically removed - it sees this and removes
the routing information for that network connection from the TCP stack,
then notices that there is now no way to reach your server, and so
returns the (wrong, as it happens) error code to VNC Viewer.
The server doesn't notice that the viewer computer has been physically
disconnected, because no-one tells it - the viewer can't tell it,
because it's been disconnected from the network. The only part of the
system that
*could* tell it is the switch to which the viewer computer was
connected, assuming it knows that the viewer computer does not have
other network connections. The only practical way to implement this
sort of functionality is with a regular "ping" and timeout combination,
but this still won't give you instantaneous disconnect, and may lead to
disconnects in the event of network delays, etc.
Regards,
Wez @ RealVNC Ltd.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Kolev, Nik
Sent: 07 March 2006 21:19
To: [email protected]
Subject: How to terminate VNC sessions immediately at network
connection drop
Hi,
I've set up a non-persistent vnc (v. 4.1.1) session through inetd (on
Solaris and Linux) and using vncviewer (v 4.1.1.) to connect from
Windows workstations.
The vncviewer is configured to not "Offer To Automatically Reconnect".
When I unplug the network cable of the windows workstation I expect
and get a vncviewer info prompt saying "read: Connection reset by peer
(10054)". What I also expect to happen is that the corresponding
server
(Xvnc) detects this and terminates the session running on the server
side immediately. Unfortunately this does not happen. The session only
gets terminated after the idle timeout (default: 3600 secs).
Is there a
way to enforce this to happen?
Here's how I start Xvnc on Solaris through inetd:
/usr/local/bin/Xvnc -inetd -securitytypes=none -desktop remote-user
-depth 16 -geometry 1024x768 -nolisten named -query localhost -once
3>/dev/null
Thanks,
-nik
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